Interlocking building block



June l, 1937. A, MARTlNlcHlo INTERLOCKING BUILDING BLOCK Filed June 25, 1936 @JMJ Patented June 1, i937 Arent oi-FICEi Application June 23,

1 Claim.

This invention realtes to building blocks and more particularly to building blocks of the cast concrete or cinder type. t

Heretofore building blocks of the cast concrete type have been made in single units and of a rather large size as compared to the size of a brick. These blocks have been laid in the building ci' a wail in much the same manner as bricks or stone, necessitating at times the provision of supports where it is necessary to carry a line of blocks across an opening, such for example as a door or window frame. The individual laying of the blocks required, as with bricks the handling of a great number which required a great amount of time, all of which contributed to the high cost in building therewith.

It is the principal object of this invention to construct a building block which in a single unit will ccmprise at least a double row of a plurality of blocks the outer face or side of which is so east as to simulate rows of bricks, blocks or stone whereby the use of the unit will decrease the time required to build a wall; which shall act as a beam across a window or frame opening and which shall be cheap and efficient so as to reduce the cost of building.

Another object of this invention relates to so forming the ends of the unit as to provide for an interlocking relationship of the same with adjoining units.

A still further object of the invention relates to the construction of similar units for use at corners, wherein the same provide for an interlocking relationship.

Other objects of the invention will become apparent as the description thereof given hereunder proceeds with reference to the accompanying drawing wherein:

'Ihe figure shows an exploded perspective View of corner block units and their relationship to each other.

Referring to the figure there is shown the structural formation of the corner block units. 'I'hese corner block units 2i? and 20a are identical.

The inside ends 2l, 2| a are formed to mate with the extending ends of another block unit while the outside ends 22, 22a are formed in a manner to be hereinafter described to interlock at right angles to each other to form the corner of a wall.

At said outside end 22, of the unit 20, the portion of the block unit dening the brick 23 of the upper row extends half its length beyond the brick 24 of the lower row and is formed of a width substantially half the width of the block 1936, Serial No. 86,752

(Cl. 'Y2-38) unit. In a similar manner the outside half of the lower brick 24 is made of the same width as the projecting end of the upper brick 23 to thereby form a recessed portion 25 of substantially square formation laterally adjacent thereto. Thus the outside end of each corner block unit comprises four faces; an end face 26 for the brick 23, an end face 2l for the brick 24, an inside end face i8 of the block unit 2i! in the same transverse plane with said end face 27, and an inside end face 29 of the block unit 2B longitudinally spaced from the end face 28. The corresponding end faces on the block unit 20a are designated respectively 26a, 27a, 28a and 29a. Preferably the width of the end face 26 should be less than the projecting length of the brick 23a by a distance equal to the mortar joint thickness, the same holding true for the other end faces.

The construction of the end portions of the corner block units 29 and 20a is such that the same interlock in a stepped arrangement whereby provide an increased area in the planes of joinder to form a union between the two units of rmaximum accuracy and strength; the manner of joining the corner block units being evident from an inspection of the figure.

It is to be distinctly understood that the faces of the interlocking building blocks can be made of diiferent colors, usually made from sand, cement, waterproof and coloring substances made from various colored powders.

While a preferred form of block unit has been shown and described it is to be understood that various changes in the structure thereof may be resorted to within the scope of the appended claim.

Having thus set forth and disclosed the nature of this invention, what is claimed is A reversible corner piece comprising a block oi substantially greater length than width and having top, bottom, front and rear faces, the upper half of the front face having an end portion thereof projecting beyond the lower half thereof, said front projecting end portion being of a thickness equal to approximately half the thickness of said corner piece, said rear face also having a projecting upper end portion, the end surface of which is in substantially the same plane as the end surface of said lower half of the front face, said corner piece in its reversed condition adapted to rest on its top face.

AQUILINO MARTINICHIO. 

